Applied a patch from dkg@fifthhorseman.net: Fix regex manipulation for word characters.

    
    in python 3.7, re.sub() started treating unknown escape sequences in
     as errors.  Fix this by sending an escaped \ where we mean to
    pass it through raw.
    
    https://docs.python.org/3/library/re.html#re.sub
 - Legacy-Id: 15892

Author: levkowetz

ietf/utils/draft.py

@@ -554,9 +554,9 @@ def extract_authors(self):
 
         def make_authpat(hon, first, last, suffix):
             def dotexp(s):
-                s = re.sub(r"\. ",    r"\w* ", s)
-                s = re.sub(r"\.$",    r"\w*", s)
-                s = re.sub(r"\.(\w)", r"\w* \1", s)
+                s = re.sub(r"\. ",    r"\\w* ", s)
+                s = re.sub(r"\.$",    r"\\w*", s)
+                s = re.sub(r"\.(\w)", r"\\w* \1", s)
                 return s
             first = dotexp(first)
             last = dotexp(last)
@@ -572,7 +572,7 @@ def dotexp(s):
 
             # Some chinese names are shown with double-letter(latin) abbreviated given names, rather than
             # a single-letter(latin) abbreviation:
-            first = re.sub(r"^([A-Z])[A-Z]+\\w\*", r"\1[-\w]+", first) 
+            first = re.sub(r"^([A-Z])[A-Z]+\\w\*", r"\1[-\\w]+", first) 
 
             # permit insertion of middle names between first and last, and
             # add possible honorific and suffix information